Design and performance analysis of an Integrated Voice/Data (IVD) protocol for a token ring network

A high performance integrated voice/data (IVD) protocol for token ring networks that operates over a wide range of data traffic levels is developed and analyzed in this dissertation;The problems raised by integrating voice/data in local area networks are identified. These problems include variable network access delay and end-to-end delay limit of voice packets, and queueing delay of data packets;In the design of the IVD protocol, a packet format is selected, conditions for selecting network parameters are derived, and a channel allocation strategy is described to provide high quality of voice over a wide range of data traffic levels while preserving satisfactory data performance;The implementation issues, specification, and operation of the proposed protocol are described based on the standard IEEE 802.5 token ring protocol. The implementation issues are studied for two principal purposes: not to modify the operating data protocol and to utilize the bandwidth for data packets when voice stations are idle. A state transition diagram is used to specify the proposed protocol;A discrete-event model of the proposed IVD protocol is developed for the accurate performance evaluation of data and real-time voice traffic. In modeling the protocol, all the necessary information which affects the state of the system are considered including location of stations;The voice/data performance of the proposed IVD token ring protocol is evaluated and the effects of voice on data and vice versa are studied. The proposed protocol provides high quality of voice without a large degradation on the data performance over a wide range of data loads

Performance investigation of a document retrieval system on a voice-data integrated token ring local area network

Lately, the interest in integration of voice and data on local computer networks has been on the rise. Subsequently, much research has been devoted to exploring various techniques that are implementable using the existing standards. This research has focused on the design issues in implementing a document retrieval system on a token ring network. The presence of voice and data traffic on the network complicates the protocol design further. The performance requirements of these traffic types are different. Voice creates stream traffic on a network, where as data traffic is bursty. Voice packets need to be delivered within a limited time interval, whereas the data emphasizes on error-free delivery. The necessity and the technological feasibility with off-the-shelf components has prompted this study. A possible solution is discussed in this dissertation;During the course of this research, due to the time consuming nature of simulation experiments, a need for efficient simulation techniques was felt. Thus, as a byproduct of the initial goal of protocol design, an approximate version of the regenerative simulation was developed and is discussed here in detail;Lastly, modeling difficulties encountered in forming an analytical model are listed and a performance analysis of the subsystems of interest is given